Can you recommend some good Percy Jackson and Fate/stay night fanfiction?

Sure. One great Percy Fate Stay Night fanfiction is 'Percy in the Grail War'. It has an interesting plot where Percy is thrown into the Fate Stay Night universe and has to navigate the complex rules of the Grail War. Another one is 'Percy and the Servants'. It focuses on Percy's interactions with the various Servants in a really engaging way.

One idea could be a crossover where the characters from Fate Stay Night end up in the world of Percy Jackson. For example, Saber could be mistaken for a demigod due to her extraordinary abilities. Another could be that the Holy Grail has some connection to the Greek gods in the Percy Jackson universe, leading to a joint quest between the two groups of characters.

One great 'Percy Jackson Fate Stay Night fanfic' is 'The Demigod's Grail Quest'. It combines the two universes really well, with Percy having to face off against Servants in a way that stays true to his character.

A great crossover aspect in fanfiction could be the exploration of the different mythologies. Percy Jackson is based on Greek mythology mainly, while Fate Stay Night draws from various mythologies for its Servants. Fanfictions could bring together the Greek gods from Percy Jackson and the heroes from different mythologies in Fate Stay Night, creating a sort of 'mythology mash - up' where the characters have to interact and deal with the differences in their mythological backgrounds.

The theme of power also emerges frequently. The different power levels and types in both universes are explored. Percy's control over water and his general demigod strength are compared and contrasted with the magical powers and combat abilities of the Fate/stay night characters. Fanfics may explore how these powers interact, whether they complement each other or create conflict.

One great Fate Stay Night fanfiction is 'Avalon's Heir'. It delves into an alternate storyline where Shirou discovers a hidden power related to Avalon early on. Another interesting one is 'Rin's Redemption'. It focuses on Rin's character development in a more complex way than in the original. And there's also 'The Lost Command Spell' which has a really engaging plot with new challenges for the characters.

One great naruto fate stay night fanfiction is 'Naruto in the Fate/stay night World'. It combines the unique ninja elements from Naruto with the magical and complex world of Fate/stay night. The story often has Naruto using his ninja skills in a new and exciting way within the Fate universe.

One great Fate Stay Night Sakura fanfiction is 'Sakura's Ascent'. It delves deep into Sakura's character development, showing her journey from a somewhat shy and reserved girl to a strong and confident individual. The story also incorporates elements of the original Fate Stay Night plot in a very creative way, making it a must - read for Sakura fans.

One great Fate Stay Night Medea fanfiction is 'Medea's Redemption'. It explores her character in a new light, showing her struggle to break free from her dark past and find a new purpose in the world of the story. It has well - written dialogue and a captivating plot that keeps you hooked from start to finish.

Well, 'Secret Desires' is another piece. It takes the existing relationships in 'Fate Stay Night' and adds a layer of passion to them. When looking for such fanfiction, it's crucial to ensure that it comes from a reliable source and respects the overall essence of the 'Fate Stay Night' franchise. Also, make sure to follow any rules or guidelines of the platform where you're accessing the fanfiction.